Casual fans might not remember, but once upon a time, the animated superstars appeared in short clips on The Tracy Ullman Show before they got their own show. While the voice actors were the same, the characters looked a lot different. Homer's head was oddly pointy. Bart looked a lot meaner. And Lisa's hair — never her best feature (sorry, Lisa, but it's true) — was even more electrified.

Which will make the crossover "Treehouse of Horror" episode, set to air on Fox on October 19, all the more creepy and fun. The encounter between the families — one of several stories set to air during the episode — will reportedly be a tongue-in-cheek tribute to the acclaimed 2001 Nicole Kidman thriller The Others.

Executive producer Al Jean joked with Entertainment Weekly about the bizarre crossover, "The great thing is we didn’t have to ask — we already had the cast hired for the Tracey Ullman Simpsons.”